What components does a solar DC Combiner Box need?

A standard DC Combiner Box should include 4 layers: Fuse Holder + Fuse, DC SPD, DC Isolator/Switch and DC MCB (optional) — all available in the BENY series.

Which DC Switch model is right for my system?

BX-08 8A for a single string, BX-13 13A, BX-15 15A, BX-26 26A for 2-3 strings, BX-39 39A for commercial. All models are rated 1000VDC and certified to TÜV/CE/IEC.

What's the difference between DC Surge and AC Surge?

DC Surge BUD-40 installs in the DC Combiner Box to protect against lightning surges traveling from the panels into the inverter. AC Surge BUA-40 installs in the AC panel after the inverter to protect against grid-side surges. A good system uses both.

How long is the BENY warranty?

BENY's standard factory warranty is 1 year. QES Energy handles warranty claims locally and coordinates directly with BENY.

// AUTHORIZED DISTRIBUTOR IN THAILAND

Complete Panel. Safe⚡

Name: BENY Electric Solar Panel Components
Brand: BENY Electric
Availability: InStock
Rating: 4.8 (62 reviews)

BENY Electric — complete components for solar electrical panels: DC Switch · DC/AC Surge Arrester · DC MCB · Fuse Holder for Combiner Box and DC Distribution Panel. TÜV · CE · IEC certified

VOLTAGE: 1000VDC· CURRENT: 8–63A· SPD CLASS: II· WARRANTY: 1YR

View All BENY Products Request Quote

// DC COMBINER BOX · BENY COMPONENTS

SCHEMATIC · 1000VDC

DC Switch

BX-26

DC Surge

BUD-40

Fuse

BR-30

MCB

BB1-63

// ANATOMY · DC COMBINER BOX

Complete Panel — 4 Layers of Protection

A proper DC Combiner Box needs 4 layers — Fuse · Surge Arrester · MCB · Isolator — BENY has it all

// L1

String Fuse Protection

Fuse Holder + DC Fuse protects against reverse current from a faulty string — trips instantly on overcurrent

BR-30 · 15A/30A

// L2

Surge Arrester (SPD)

Discharges transient voltage from lightning / switching to ground — protects the inverter from surge damage

BUD-40 DC · BUA-40 AC

// L3

DC Isolator / Switch

DC disconnect switch for maintenance — safely breaks the circuit between panels and the inverter

BX-08 · BX-26 · BX-39

// Layer 04 · Bonus

DC Circuit Breaker (MCB)

Add an MCB such as BB1-63 or BB1F for commercial systems that need trip-on-overload plus manual reset

BB1-63 · 32A/63A
DC MCB · 2P/4P

// CERTIFIED BY AUTHORITIES

Internationally Certified Standards

BENY Electric is engineered to meet the world's most demanding electrical safety standards

TÜV Rheinland

Germany Quality

EU Conformity

IEC 60898

Circuit Breakers

IEC 61643

Surge Arresters

// FAQ

Frequently Asked Questions

QES Energy is the authorized distributor of BENY Electric in Thailand, carrying the full lineup of solar electrical panel components — DC Switch, DC/AC Surge Arrester, DC MCB and Fuse Holder. 100% genuine with a 1-year warranty. Contact us at Line @qesenergy.

A standard DC Combiner Box should include 4 layers — (1) Fuse Holder + Fuse to protect against reverse current on each string · (2) DC Surge Arrester (SPD) to discharge lightning surges · (3) DC Isolator/Switch for maintenance disconnect · (4) DC MCB (optional) for larger commercial installations.

Choose by current rating — BX-08: 8A 1000VDC for 1-string residential systems · BX-13: 13A · BX-15: 15A · BX-26: 26A for 2–3 strings · BX-39: 39A for larger commercial systems. All models are rated 1000VDC and certified to TÜV/CE/IEC.

DC Surge (BUD-40): installs inside the DC Combiner Box — protects against lightning surges traveling from the solar panels into the inverter (BUD-40-2 = 600V, BUD-40-3 = 1000V). AC Surge (BUA-40): installs in the AC panel after the inverter — protects against grid-side surges (BUA-40-2 = 2P single-phase, BUA-40-4 = 4P three-phase). A well-designed system uses both.

BENY's standard factory warranty is 1 year, covering DC Switch, Surge Arrester, MCB and Fuse Holder products. QES Energy handles warranty claims locally and coordinates directly with BENY — no need to ship anything back to China.

Complete Panel. Safe⚡